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      Question

      Dev borrowed Rs. 6400 at R% S.I. and Rs. 5600 at (R +

      5)% S.I. for 3 years. If the total interest came to Rs. 4800, find the rate applicable on Rs. 5600.
      A 20% Correct Answer Incorrect Answer
      B 18% Correct Answer Incorrect Answer
      C 16% Correct Answer Incorrect Answer
      D 32% Correct Answer Incorrect Answer

      Solution

      According to question, 6400 ร— R/100 ร— 3 + 5600 ร— (R + 5)/100 ร— 3 = 4800 192R + 168R + 168 ร— 5 = 4800 360R + 840 = 4800 360R = 3960 R = 11% So, R + 5 = 16%

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